Chitose Haru, Kumagai Eri, Ryuou Sarasa, Mukagi Kiri, Mukagi Yuori, Minosaku Sasame, Nishio Mirai, Yukino Hiyo, Gushiken Shufu, Kintoki Kotoko, and Morooka Lulu, all members of the idol group "PINERECORDS" (commonly known as PIRECO), are members of an idol group called "Music Girls". However, "Music Girls" are C-class idols that are not popular at all. "Music Girls" is neither popular nor popular and has a lot of deficits, but producer Ikehashi and the members are still working hard. Ikehashi believes that "Music Girls" needs new members. Idols who are like the detonator of success! So he worked day and night for the selection. One day like this, "Music Girls" met the protagonist Hanako...